/Engine/Source/Runtime/Engine/Classes/Kismet/GameplayStatics.h
Transforms the given 2D screen space coordinate into a 3D world-space point and direction.
static bool DeprojectScreenToWorld ( [APlayerController](API\Runtime\Engine\GameFramework\APlayerController) const * Player, const FVector2D & ScreenPosition, FVector & WorldPosition, FVector & WorldDirection )